@@ -104,6 +104,12 @@ typedef struct VirtQueueElement
#define VIRTIO_DEVICE(obj) \
OBJECT_CHECK(VirtIODevice, (obj), TYPE_VIRTIO_DEVICE)
+enum virtio_device_endian {
+ VIRTIO_DEVICE_ENDIAN_UNKNOWN,
+ VIRTIO_DEVICE_ENDIAN_LITTLE,
+ VIRTIO_DEVICE_ENDIAN_BIG,
+};
+
struct VirtIODevice
{
DeviceState parent_obj;
@@ -121,6 +127,7 @@ struct VirtIODevice
bool vm_running;
VMChangeStateEntry *vmstate;
char *bus_name;
+ uint8_t device_endian;
};
typedef struct VirtioDeviceClass {
@@ -256,9 +263,9 @@ void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,
void virtio_queue_notify_vq(VirtQueue *vq);
void virtio_irq(VirtQueue *vq);
-bool target_words_bigendian(void);
-static inline bool virtio_is_big_endian(void)
+static inline bool virtio_is_big_endian(VirtIODevice *vdev)
{
- return target_words_bigendian();
+ assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
+ return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG;
}
#endif
@@ -406,13 +406,13 @@ static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr,
break;
case 2:
val = virtio_config_readw(vdev, addr);
- if (virtio_is_big_endian()) {
+ if (virtio_is_big_endian(vdev)) {
val = bswap16(val);
}
break;
case 4:
val = virtio_config_readl(vdev, addr);
- if (virtio_is_big_endian()) {
+ if (virtio_is_big_endian(vdev)) {
val = bswap32(val);
}
break;
@@ -440,13 +440,13 @@ static void virtio_pci_config_write(void *opaque, hwaddr addr,
virtio_config_writeb(vdev, addr, val);
break;
case 2:
- if (virtio_is_big_endian()) {
+ if (virtio_is_big_endian(vdev)) {
val = bswap16(val);
}
virtio_config_writew(vdev, addr, val);
break;
case 4:
- if (virtio_is_big_endian()) {
+ if (virtio_is_big_endian(vdev)) {
val = bswap32(val);
}
virtio_config_writel(vdev, addr, val);
@@ -545,6 +545,27 @@ void virtio_set_status(VirtIODevice *vdev, uint8_t val)
vdev->status = val;
}
+bool target_words_bigendian(void);
+static enum virtio_device_endian virtio_default_endian(void)
+{
+ if (target_words_bigendian()) {
+ return VIRTIO_DEVICE_ENDIAN_BIG;
+ } else {
+ return VIRTIO_DEVICE_ENDIAN_LITTLE;
+ }
+}
+
+static enum virtio_device_endian virtio_current_cpu_endian(void)
+{
+ CPUClass *cc = CPU_GET_CLASS(current_cpu);
+
+ if (cc->virtio_is_big_endian(current_cpu)) {
+ return VIRTIO_DEVICE_ENDIAN_BIG;
+ } else {
+ return VIRTIO_DEVICE_ENDIAN_LITTLE;
+ }
+}
+
void virtio_reset(void *opaque)
{
VirtIODevice *vdev = opaque;
@@ -552,6 +573,13 @@ void virtio_reset(void *opaque)
int i;
virtio_set_status(vdev, 0);
+ if (current_cpu) {
+ /* Guest initiated reset */
+ vdev->device_endian = virtio_current_cpu_endian();
+ } else {
+ /* System reset */
+ vdev->device_endian = virtio_default_endian();
+ }
if (k->reset) {
k->reset(vdev);
@@ -840,6 +868,24 @@ void virtio_notify_config(VirtIODevice *vdev)
virtio_notify_vector(vdev, vdev->config_vector);
}
+static bool virtio_device_endian_needed(void *opaque)
+{
+ VirtIODevice *vdev = opaque;
+
+ assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
+ return vdev->device_endian != virtio_default_endian();
+}
+
+static const VMStateDescription vmstate_virtio_device_endian = {
+ .name = "virtio/device_endian",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT8(device_endian, VirtIODevice),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static const VMStateDescription vmstate_virtio = {
.name = "virtio",
.version_id = 1,
@@ -847,6 +893,13 @@ static const VMStateDescription vmstate_virtio = {
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_END_OF_LIST()
+ },
+ .subsections = (VMStateSubsection[]) {
+ {
+ .vmsd = &vmstate_virtio_device_endian,
+ .needed = &virtio_device_endian_needed
+ },
+ { 0 }
}
};
@@ -925,6 +978,12 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
+ /*
+ * We poison the endianness to ensure it does not get used before
+ * subsections have been loaded.
+ */
+ vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN;
+
if (k->load_config) {
ret = k->load_config(qbus->parent, f);
if (ret)
@@ -977,18 +1036,7 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
vdev->vq[i].notification = true;
if (vdev->vq[i].pa) {
- uint16_t nheads;
virtqueue_init(&vdev->vq[i]);
- nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx;
- /* Check it isn't doing very strange things with descriptor numbers. */
- if (nheads > vdev->vq[i].vring.num) {
- error_report("VQ %d size 0x%x Guest index 0x%x "
- "inconsistent with Host index 0x%x: delta 0x%x",
- i, vdev->vq[i].vring.num,
- vring_avail_idx(&vdev->vq[i]),
- vdev->vq[i].last_avail_idx, nheads);
- return -1;
- }
} else if (vdev->vq[i].last_avail_idx) {
error_report("VQ %d address 0x0 "
"inconsistent with Host index 0x%x",
@@ -1011,7 +1059,33 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
}
}
- return vmstate_load_state(f, &vmstate_virtio, vdev, 1);
+ /* Subsections */
+ ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1);
+ if (ret) {
+ return ret;
+ }
+
+ if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) {
+ vdev->device_endian = virtio_default_endian();
+ }
+
+ for (i = 0; i < num; i++) {
+ if (vdev->vq[i].pa) {
+ uint16_t nheads;
+ nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx;
+ /* Check it isn't doing strange things with descriptor numbers. */
+ if (nheads > vdev->vq[i].vring.num) {
+ error_report("VQ %d size 0x%x Guest index 0x%x "
+ "inconsistent with Host index 0x%x: delta 0x%x",
+ i, vdev->vq[i].vring.num,
+ vring_avail_idx(&vdev->vq[i]),
+ vdev->vq[i].last_avail_idx, nheads);
+ return -1;
+ }
+ }
+ }
+
+ return 0;
}
void virtio_cleanup(VirtIODevice *vdev)
@@ -1068,6 +1142,7 @@ void virtio_init(VirtIODevice *vdev, const char *name,
}
vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change,
vdev);
+ vdev->device_endian = virtio_default_endian();
}
hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n)